| alpha-msh | <chemical> A 13-amino acid peptide derived from the anterior pituitary gland in man and from the pars intermedia in lower vertebrates. Its amino acid sequence is identical to the first 13 amino acids of acth. It influences the formation of deposition of melanin in the body and produces colour changes in the skin of amphibians, fishes and reptiles. It is secreted in humans only during foetal life and occasionally during pregnancy. Chemical name: alpha-Melanotropin (pig) (12 Dec 1998) |
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| alpha mucase | <chemical> Combination of mucopolysaccharidases and chymotrypsin (26 Jun 1999) |
| alpha-(N-acetylaminomethylene)succinic acid hydrolase | <enzyme> Involved in degradation of vitamin b6; forms acetic acid plus ammonia plus carbon dioxide plus succinic monoaldehyde Registry number: EC 3.5.1.- Synonym: compound a hydrolase (26 Jun 1999) |
| alpha-N-acetyl-D-glucosaminidase | <enzyme> Believed to be deficient in sanfilippo syndrome type b Registry number: EC 3.2.1.50 Synonym: alpha-n-acetylglucosaminidase (26 Jun 1999) |
| alpha-N-acetylgalactosaminidase | <enzyme> An enzyme that hydrolyzes 2-acetamido-2-deoxy-alpha-d-galactosides to the alcohol and free 2-acetamido-2-deoxy-d-galactose. A deficiency of this enzyme will result in Schindler disease. (05 Mar 2000) |
| alpha-N-acetylglucosaminidase | <enzyme> An enzyme that hydrolyzes glycosides of N-acetylglucosamine producing the alcohol and N-acetylglucosamine. A deficiency of this enzyme results in mucopolysaccharidosis III B. (05 Mar 2000) |
| alpha-N-acylamino acid hydrolase | <enzyme> Functions in catabolism of n-acetylamino acids resulting from turnover of alpha-n-acetylated proteins Registry number: EC 3.5.1.- Synonym: alpha-n-acetylamino acid hydrolase, anaa-hase, n-acylaminoacyl-peptide hydrolase (26 Jun 1999) |
| alpha-naphthylthiourea | 1-(1-Naphthyl)-2-thiourea;a derivative of thiourea; a highly toxic antithyroid agent, especially to small mammals, causing pulmonary oedema, fatty degeneration of the liver, and low body temperature; used as a rat poison. Acronym: ANTU (05 Mar 2000) |
| alpha-neoagarooligosaccharide hydrolase | <enzyme> Hydrolyzes the alpha-1,3 linkage of neoagarooligosaccharides; from marine bacterium, vibrio sp.; mw 42 kD; amino acid sequence has been determined Registry number: EC 3.2.1.- Synonym: alpha-naos hydrolase (26 Jun 1999) |
| alpha-oxidation | A form of oxidation of fatty acids in which carbons are removed one at a time in the form of CO2; the alpha-carbon is first hydroxylated and then converted into a carbonyl; a deficiency of this pathway is associated with Refsum's disease. (05 Mar 2000) |
| alpha particle | <physics> A radioactive particle made up of two protons and two neutrons, these particles are created by the decay of a radioactive material or by nuclear bombardment, and they are the same as the nucleus of a helium-4 atom. (09 Oct 1997) |
| alpha particles | Positively charged particles composed of two protons and two neutrons, i.e., helium nuclei, emitted during disintegration of very heavy isotopes; a beam of alpha particles or an alpha ray has very strong ionizing power, but weak penetrability. (12 Dec 1998) |
| alpha-phenoxyethylpenicillin potassium | A penicillin preparation that is stable in gastric acid and is rapidly but only partially absorbed from the gastrointestinal tract. Synonym: alpha-phenoxyethylpenicillin potassium, penicillin B. (05 Mar 2000) |
| alpha-phenoxypropylpenicillin potassium | A semisynthetic acid-stable penicillin that may be more effective than penicillin G. Synonym: alpha-phenoxypropylpenicillin potassium. (05 Mar 2000) |
| alpha-pinene oxide lyase | <enzyme> From nocardia sp. Strain p18.3; catalyses the cleavage of both rings of the bicyclic structure with the formation of 2-methyl-5-isopropylhexa-2,5-dienal Registry number: EC 4.1.2.- Synonym: alpha-pinene oxide lyase (decyclizing) (26 Jun 1999) |